First of all, this thing is a variant of Antivirus 2008/2009.
It's got an interesting way of spreading itself, via IM, primarily MSN Messenger (any flavor).
My daughter got my machine infested entirely by accident while chatting in MSN IM. Didn't click any links, accept any file transfers, nothing like that. She was simply chatting, and then all of sudden, there it was. So, been trying to clean this beastie OUT for the last few days.
Here's the thing..
I deleted all associated files, killed all associated processes, and deleted all associated registry entries. NORMALLY, that will then allow a user to then run their anti malware software. Well, this thing is also a TSR, so while I did all that, it still didn't kill it enough to disable it. Which means that none of my malware removal stuff would work. As it turns it all OFF. This also tends to turn off most antivirus programs. Two of the few exceptions that I know of are Kaspersky and Avira. With Avira (I use it, so have experienced what'll happen), it turns off the Antivirus guard section. Simple enough fix, you simple turn the service back on, and the program will then continue to work as it should.
So, in an effort to de-infest my machine, found a malware utility that is free, and that this thing not only doesn't turn off, the program then finds it in the memory, deletes all instances, and then your machine is once again free from the nasty.
A-Squared Free
This program offers a 2-in-1 package, or simply the malware removal tool.